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Research work is aimed at modeling the process of milling surfaces of complex shape in automated CAD/CAM systems. To reduce labour input of this process, an algorithm for designing milling operations is proposed. The algorithm is implemented in the form of software written in the VBA programming language from Office Excel. The software allows to select cutting tools and cutting modes for roughing, semi-finishing and finishing milling. The initial data for this are: processed material, part configuration, profile depth, technical requirements on the surface. The work of the algorithm was tested on the parts of the mold type. It is found that the set of cutting tools for all types of milling surfaces of complex shape is selected taking into account the overall dimensions of the treated surface, its curvature and radii of surfaces rounding. The results of simulation of mold processing in Sprut CAM system according to the assigned set of cutting tools and cutting modes allowed to choose the tool path with minimal processing time.

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